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                <h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p>之前的时候，使用JDBC连接数据库，写着写着多了个连接池，之后又想到把连接信息放在资源文件里，当时想着这么做还挺厉害，现在发现有点LOW，前人早就做了，而且形成了现成的框架。</p>
<h2 id="什么是MyBatis"><a href="#什么是MyBatis" class="headerlink" title="什么是MyBatis"></a>什么是MyBatis</h2><blockquote>
<p>MyBatis 本是apache的一个开源项目iBatis, 2010年这个项目由apache software foundation 迁移到了google code，并且改名为MyBatis。是一个基于Java的持久层框架</p>
</blockquote>
<h2 id="为什么我们要用Mybatis？"><a href="#为什么我们要用Mybatis？" class="headerlink" title="为什么我们要用Mybatis？"></a>为什么我们要用Mybatis？</h2><p>无论是Mybatis、Hibernate都是ORM的一种实现框架，都是对JDBC的一种封装！</p>
<p>Hibernate是一个比较老旧的框架，用过他的都知道，只要你会用，用起来十分舒服…啥sql代码都不用写…但是呢，它也是有的缺点：：<strong>处理复杂业务时，灵活度差, 复杂的HQL难写难理解，例如多表查询的HQL语句</strong></p>
<p>而JDBC很容易理解，就那么几个固定的步骤，就是开发起来太麻烦了，因为什么都要我们自己干..</p>
<p>而SpringDAO其实就是JDBC的一层封装，就类似于dbutils一样，没有特别出彩的地方….</p>
<p>我们可以认为，<strong>Mybatis就是jdbc和Hibernate之间的一个平衡点</strong>…毕竟现在业界都是用这个框架，也不能不学呀！</p>
<h2 id="Mybatis工作流程"><a href="#Mybatis工作流程" class="headerlink" title="Mybatis工作流程"></a>Mybatis工作流程</h2><ul>
<li><strong>通过Reader对象读取Mybatis配置文件</strong></li>
<li><strong>通过SqlSessionFactoryBuilder对象创建SqlSessionFactory对象</strong></li>
<li><strong>获取当前线程的SQLSession</strong></li>
<li><strong>事务默认开启</strong></li>
<li><strong>通过SQLSession读取映射文件中的操作编号，从而读取SQL语句</strong></li>
<li><strong>提交事务</strong></li>
<li><strong>关闭资源</strong></li>
</ul>
<h2 id="Mybatis快速入门"><a href="#Mybatis快速入门" class="headerlink" title="Mybatis快速入门"></a>Mybatis快速入门</h2><h3 id="导入开发包"><a href="#导入开发包" class="headerlink" title="导入开发包"></a>导入开发包</h3><p>导入Mybatis开发包</p>
<ul>
<li>mybatis-3.1.1.jar</li>
<li>commons-logging-1.1.1.jar</li>
<li>log4j-1.2.16.jar</li>
<li>cglib-2.2.2.jar</li>
<li>asm-3.3.1.jar</li>
</ul>
<p>导入mysql/oracle开发包</p>
<ul>
<li>mysql-connector-java-5.1.7-bin.jar</li>
<li>Oracle 11g 11.2.0.1.0 JDBC_ojdbc6.jar</li>
</ul>
<h3 id="准备测试工作"><a href="#准备测试工作" class="headerlink" title="准备测试工作"></a>准备测试工作</h3><p>创建一张表</p>
<pre class=" language-sql"><code class="language-sql"><span class="token keyword">create</span> <span class="token keyword">table</span> students<span class="token punctuation">(</span>
  id  <span class="token keyword">int</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span> <span class="token keyword">primary</span> <span class="token keyword">key</span><span class="token punctuation">,</span>
  name <span class="token keyword">varchar</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  sal <span class="token keyword">double</span><span class="token punctuation">(</span><span class="token number">8</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span></code></pre>
<p>创建实体类</p>
<pre class=" language-java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Student</span> <span class="token punctuation">{</span>
    <span class="token keyword">private</span> Integer id<span class="token punctuation">;</span>
    <span class="token keyword">private</span> String name<span class="token punctuation">;</span>
    <span class="token keyword">private</span> Double sal<span class="token punctuation">;</span>

    <span class="token keyword">public</span> <span class="token function">Student</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">public</span> Integer <span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> id<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setId</span><span class="token punctuation">(</span>Integer id<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>id <span class="token operator">=</span> id<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">public</span> String <span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> name<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setName</span><span class="token punctuation">(</span>String name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">public</span> Double <span class="token function">getSal</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> sal<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setSal</span><span class="token punctuation">(</span>Double sal<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>sal <span class="token operator">=</span> sal<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span></code></pre>
<h3 id="创建mybatis配置文件"><a href="#创建mybatis配置文件" class="headerlink" title="创建mybatis配置文件"></a>创建mybatis配置文件</h3><pre class=" language-xml"><code class="language-xml"><span class="token prolog">&lt;?xml version="1.0" encoding="UTF-8"?></span>
<span class="token doctype">&lt;!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd"></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>configuration</span><span class="token punctuation">></span></span>


    <span class="token comment" spellcheck="true">&lt;!-- 加载类路径下的属性文件 --></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>properties</span> <span class="token attr-name">resource</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>db.properties<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>

    <span class="token comment" spellcheck="true">&lt;!-- 设置一个默认的连接环境信息 --></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>environments</span> <span class="token attr-name">default</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>mysql_developer<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token comment" spellcheck="true">&lt;!-- 连接环境信息，取一个任意唯一的名字 --></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>environment</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>mysql_developer<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token comment" spellcheck="true">&lt;!-- mybatis使用jdbc事务管理方式 --></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>transactionManager</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>jdbc<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
            <span class="token comment" spellcheck="true">&lt;!-- mybatis使用连接池方式来获取连接 --></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dataSource</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>pooled<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                <span class="token comment" spellcheck="true">&lt;!-- 配置与数据库交互的4个必要属性 --></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>driver<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>${mysql.driver}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>url<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>${mysql.url}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>${mysql.username}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>${mysql.password}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dataSource</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>environment</span><span class="token punctuation">></span></span>


        <span class="token comment" spellcheck="true">&lt;!-- 连接环境信息，取一个任意唯一的名字 --></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>environment</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>oracle_developer<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token comment" spellcheck="true">&lt;!-- mybatis使用jdbc事务管理方式 --></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>transactionManager</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>jdbc<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
            <span class="token comment" spellcheck="true">&lt;!-- mybatis使用连接池方式来获取连接 --></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dataSource</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>pooled<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                <span class="token comment" spellcheck="true">&lt;!-- 配置与数据库交互的4个必要属性 --></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>driver<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>${oracle.driver}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>url<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>${oracle.url}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>${oracle.username}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>${oracle.password}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dataSource</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>environment</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>environments</span><span class="token punctuation">></span></span>


<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>configuration</span><span class="token punctuation">></span></span></code></pre>
<h3 id="编写工具类测试是否获取到连接"><a href="#编写工具类测试是否获取到连接" class="headerlink" title="编写工具类测试是否获取到连接"></a>编写工具类测试是否获取到连接</h3><pre class=" language-java"><code class="language-java"><span class="token keyword">package</span> cn<span class="token punctuation">.</span>itcast<span class="token punctuation">.</span>javaee<span class="token punctuation">.</span>mybatis<span class="token punctuation">.</span>util<span class="token punctuation">;</span>

<span class="token keyword">import</span> java<span class="token punctuation">.</span>io<span class="token punctuation">.</span>IOException<span class="token punctuation">;</span>
<span class="token keyword">import</span> java<span class="token punctuation">.</span>io<span class="token punctuation">.</span>Reader<span class="token punctuation">;</span>
<span class="token keyword">import</span> java<span class="token punctuation">.</span>sql<span class="token punctuation">.</span>Connection<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>ibatis<span class="token punctuation">.</span>io<span class="token punctuation">.</span>Resources<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>ibatis<span class="token punctuation">.</span>session<span class="token punctuation">.</span>SqlSession<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>ibatis<span class="token punctuation">.</span>session<span class="token punctuation">.</span>SqlSessionFactory<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>ibatis<span class="token punctuation">.</span>session<span class="token punctuation">.</span>SqlSessionFactoryBuilder<span class="token punctuation">;</span>

<span class="token comment" spellcheck="true">/**
 * 工具类
 * @author AdminTC
 */</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MybatisUtil</span> <span class="token punctuation">{</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> ThreadLocal<span class="token operator">&lt;</span>SqlSession<span class="token operator">></span> threadLocal <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ThreadLocal</span><span class="token operator">&lt;</span>SqlSession<span class="token operator">></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> SqlSessionFactory sqlSessionFactory<span class="token punctuation">;</span>
    <span class="token comment" spellcheck="true">/**
     * 加载位于src/mybatis.xml配置文件
     */</span>
    <span class="token keyword">static</span><span class="token punctuation">{</span>
        <span class="token keyword">try</span> <span class="token punctuation">{</span>
            Reader reader <span class="token operator">=</span> Resources<span class="token punctuation">.</span><span class="token function">getResourceAsReader</span><span class="token punctuation">(</span><span class="token string">"mybatis.xml"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            sqlSessionFactory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SqlSessionFactoryBuilder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span>reader<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">RuntimeException</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token comment" spellcheck="true">/**
     * 禁止外界通过new方法创建 
     */</span>
    <span class="token keyword">private</span> <span class="token function">MybatisUtil</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span><span class="token punctuation">}</span>
    <span class="token comment" spellcheck="true">/**
     * 获取SqlSession
     */</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> SqlSession <span class="token function">getSqlSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token comment" spellcheck="true">//从当前线程中获取SqlSession对象</span>
        SqlSession sqlSession <span class="token operator">=</span> threadLocal<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment" spellcheck="true">//如果SqlSession对象为空</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>sqlSession <span class="token operator">==</span> null<span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment" spellcheck="true">//在SqlSessionFactory非空的情况下，获取SqlSession对象</span>
            sqlSession <span class="token operator">=</span> sqlSessionFactory<span class="token punctuation">.</span><span class="token function">openSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment" spellcheck="true">//将SqlSession对象与当前线程绑定在一起</span>
            threadLocal<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>sqlSession<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token comment" spellcheck="true">//返回SqlSession对象</span>
        <span class="token keyword">return</span> sqlSession<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token comment" spellcheck="true">/**
     * 关闭SqlSession与当前线程分开
     */</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">closeSqlSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token comment" spellcheck="true">//从当前线程中获取SqlSession对象</span>
        SqlSession sqlSession <span class="token operator">=</span> threadLocal<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment" spellcheck="true">//如果SqlSession对象非空</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>sqlSession <span class="token operator">!=</span> null<span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment" spellcheck="true">//关闭SqlSession对象</span>
            sqlSession<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment" spellcheck="true">//分开当前线程与SqlSession对象的关系，目的是让GC尽早回收</span>
            threadLocal<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>    
    <span class="token comment" spellcheck="true">/**
     * 测试
     */</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span>String<span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        Connection conn <span class="token operator">=</span> MybatisUtil<span class="token punctuation">.</span><span class="token function">getSqlSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>conn<span class="token operator">!=</span>null<span class="token operator">?</span><span class="token string">"连接成功"</span><span class="token operator">:</span><span class="token string">"连接失败"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="创建实体与映射关系文件"><a href="#创建实体与映射关系文件" class="headerlink" title="创建实体与映射关系文件"></a>创建实体与映射关系文件</h3><pre class=" language-xml"><code class="language-xml">
<span class="token prolog">&lt;?xml version="1.0" encoding="UTF-8" ?></span>
<span class="token doctype">&lt;!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd"></span>

<span class="token comment" spellcheck="true">&lt;!-- namespace属性是名称空间，必须唯一 --></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>mapper</span> <span class="token attr-name">namespace</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>cn.itcast.javaee.mybatis.app04.Student<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>    

    <span class="token comment" spellcheck="true">&lt;!-- resultMap标签:映射实体与表 
         type属性：表示实体全路径名
         id属性：为实体与表的映射取一个任意的唯一的名字
    --></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>resultMap</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>student<span class="token punctuation">"</span></span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>studentMap<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token comment" spellcheck="true">&lt;!-- id标签:映射主键属性
             result标签：映射非主键属性
             property属性:实体的属性名
             column属性：表的字段名     
        --></span>                            
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>id</span> <span class="token attr-name">property</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>id<span class="token punctuation">"</span></span> <span class="token attr-name">column</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>id<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>result</span> <span class="token attr-name">property</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>name<span class="token punctuation">"</span></span> <span class="token attr-name">column</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>name<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>result</span> <span class="token attr-name">property</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>sal<span class="token punctuation">"</span></span> <span class="token attr-name">column</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>sal<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>resultMap</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>mapper</span><span class="token punctuation">></span></span></code></pre>
<p>现在我们已经有了Mybatis的配置文件和表与实体之前的映射文件了，因此我们要将配置文件和映射文件关联起来</p>
<pre class=" language-xml"><code class="language-xml">    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>mappers</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>mapper</span> <span class="token attr-name">resource</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>StudentMapper.xml<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>mappers</span><span class="token punctuation">></span></span></code></pre>
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